Perhaps you should try some spelling variations:
"dung doanh toan snippets" » "dung dan toan snippets", "dung dong toan snippets", "dung doanh hoan snippets", "dung doanh doanh snippets", "dung doanh thanh snippets"
"hang java java snippets" » "hang va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung doanh toan snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung doanh toan snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung doanh toan snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung doanh toan snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.